function market0() {
    $.ajax(
        {
            type: "get",
            url: "http://127.0.0.1:5001/task0",
            data: {},
            dataType: "json",
            success: function (data) {
                $(data).each(function (n) {
                    var text = data[n];
                    AppendNode(text);
                });
            },
            error: function (err) {
                console.log(err);
            }
        }

    )
}
function AppendNode(text) {
    $("#group").append("<option>" + text + "</option>")
}
market0();